CN108646088B

CN108646088B - Master-slave multi-loop electric energy monitoring terminal and method capable of achieving discrete distribution

Info

Publication number: CN108646088B
Application number: CN201810360626.1A
Authority: CN
Inventors: 黄水生; 夏国平; 马如明
Original assignee: Nanjing Tiansu Automation Control System Co ltd
Current assignee: Nanjing Tiansu Automation Control System Co ltd
Priority date: 2018-04-20
Filing date: 2018-04-20
Publication date: 2020-07-28
Anticipated expiration: 2038-04-20
Also published as: CN108646088A

Abstract

The invention discloses a master-slave multi-loop electric energy monitoring terminal capable of being distributed discretely, which comprises a master machine and a plurality of slave machines, wherein the master machine comprises a current signal acquisition module, a voltage signal acquisition module, a metering module, a power supply module, a controller module, a communication module, a man-machine interaction module and a master-slave machine interface module, the slave machines comprise a current signal acquisition module, a measurement control module and a master-slave machine interface module, each interface of the master-slave machine interface module of the master machine is connected with one interface of the master-slave machine interface module of one slave machine, and the other interface of the master-slave machine interface module of the connected slave machine is connected with any interface of the next slave machine. The main machine can independently run, the auxiliary machines can be discretely distributed, the relative installation positions of the auxiliary machines are not limited, the electric energy monitoring of a plurality of three-phase loops or single-phase loops is realized, the multi-point puncture electricity taking construction in a reconstruction project is avoided, the difficulty and the construction period of loop combing are reduced, and the reconstruction safety is improved.

Description

Master-slave multi-loop electric energy monitoring terminal and method capable of achieving discrete distribution

Technical Field

The invention relates to a master-slave multi-loop electric energy monitoring terminal capable of being distributed discretely and a method, belonging to the technical field of electric power monitoring and energy consumption monitoring.

Background

At present, the method specifically provides the subentry measurement of main electric facilities, and the measurement is carried out to an economic accounting unit for office buildings, markets, dormitories and the like; medical wards, hotel rooms and classrooms of schools are required to be measured according to floors or function partitions, and are included in examination and completion acceptance standards.

Under the policy background, building energy consumption monitoring systems and energy efficiency management systems are rapidly developed and widely applied, and implementation and function realization of system projects need support of field metering instruments to perform classified and itemized metering of power utilization facilities or regions.

In projects such as building energy consumption monitoring systems, energy efficiency management systems and the like in industries such as hospitals, the remodeling project accounts for a large proportion, and measurement products which are mainstream in the current market consider more new projects and are used for solving the problems that the remodeling project often encounters construction inconvenience and the like. Therefore, the measuring product is more convenient to install and construct in a modified project, can meet the requirements of classified and item-divided measurement, and has higher competitiveness and market prospect than the traditional measuring product.

In transformation projects such as hospitals, airports, commercial properties and the like, the time for which power supply loops are not allowed to be powered off or can be powered off is short, so that great difficulty is caused in installing a meter on site; on the other hand, the original distribution box and distribution cabinet in the field of the reconstruction project are best in demand, and the outgoing line layout of the branch loop in the distribution box on a similar floor is quite compact, so that higher demands are put on the volume and the installation mode of the additionally installed meter, the meter can be installed by utilizing the residual space of the original box body and cabinet body on the field, and the energy consumption measurement of the branch loop can be adapted; moreover, wired communication line laying construction of a reconstruction project is very difficult in many cases, and a wireless communication solution needs to be provided; users are sensitive in project modification costs.

Aiming at the problems in the transformation project, the Nanjing New Union electronics provides a solution of an integrated small intelligent power acquisition module-201510469865.7 and 105021929B, the voltage signal and the power are acquired by adopting puncture electricity taking, and a product is fixed on a tested cable by a multiplexing puncture structure, the product integrates a current transformer and a wireless communication module, can work only by being externally connected with a zero line, realizes the aims of quick installation without power failure, wireless communication and small installation space, and provides great convenience for the engineering implementation of the transformation project. At the same time, it must be mentioned that this solution still has some deficiencies or room to be improved: 1. one single-phase power cable uses one acquisition module, one three-phase loop uses three acquisition modules, each acquisition module is configured with one wireless communication sub-module, the hardware cost of the scheme is relatively high, and the workload of communication networking is relatively large; 2. the acquisition module comprises a wireless communication sub-module, a current acquisition module, a power supply module and a voltage puncture electricity-taking module, has relatively large integral volume, is only suitable for being used on a high-current loop such as a low-voltage distribution room and the like, is not suitable for metering occasions with extremely small available installation space of branch power utilization outgoing loops such as a floor distribution box and the like, and has certain limitation on the application range; 3. each tested cable needs to be punctured to damage the cable insulation.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, provides a master-slave multi-loop electric energy monitoring terminal capable of being distributed discretely and a method thereof, and solves the problems that the conventional monitoring terminal uses one acquisition module for one single-phase power cable, needs multi-point puncture power acquisition construction to acquire voltage signals, causes relatively high cost of case hardware, relatively large workload of communication networking and can not flexibly realize multi-loop measurement or independent measurement functions.

The invention specifically adopts the following technical scheme to solve the technical problems:

a master-slave multi-loop electric energy monitoring terminal capable of being distributed discretely comprises a master machine and a plurality of slave machines, wherein the master machine comprises a current signal acquisition module, a voltage signal acquisition module, a metering module, a power supply module, a controller module, a communication module, a man-machine interaction module and a master-slave machine interface module, the input end of the metering module is respectively connected with the output end of the current signal acquisition module and one output end of the voltage signal acquisition module, and the output end of the metering module is connected with the controller module; the controller module is also connected with the communication module, the man-machine interaction module and the master-slave machine interface module respectively; the other output end of the voltage signal acquisition module is respectively connected with the power supply module and the master-slave machine interface module, and the power supply module is connected with the master-slave machine interface module;

each slave machine comprises a current signal acquisition module, a measurement control module and a master-slave machine interface module, wherein the output end of the current signal acquisition module is connected with the measurement control module, and the measurement control module is connected with the master-slave machine interface module;

each interface of the master-slave interface module of the master is connected with one interface of the master-slave interface module of one slave, and the other interface of the master-slave interface module of the connected slave is connected with any interface of the master-slave interface module of the next slave.

Further, as a preferred technical solution of the present invention: the voltage signal acquisition module of the host comprises three voltage signal acquisition loops, wherein each phase voltage signal acquisition loop comprises a voltage reduction circuit and a filter circuit which are connected.

Further, as a preferred technical solution of the present invention: the master-slave machine interface module of the host machine comprises a sampling voltage signal level lifting and following module, a power output current limiting switch module and three crystal head jacks, wherein each crystal head jack respectively comprises a power supply, a voltage and a communication three signal loop, the power supply signal loop is connected with the power output current limiting switch module, the voltage signal loop is connected with the sampling voltage signal level lifting and following module, and the communication loop is connected with the communication module of the host machine.

Further, as a preferred technical solution of the present invention: the master-slave machine interface module of the slave machine comprises two crystal head jacks, each crystal head jack comprises three signal loops of power supply, voltage and communication, and the power supply loop, the voltage loop and the communication loop of one crystal head jack are respectively connected with the power supply loop, the voltage loop and the communication loop of the other crystal head jack in parallel.

Further, as a preferred technical solution of the present invention: and each slave machine is provided with a ribbon limiting pile for being fixed on the tested loop cable.

The invention also provides a master-slave multi-loop electric energy monitoring method capable of realizing discrete distribution, which is based on a master machine and a plurality of slave machines and comprises the following steps:

collecting a voltage signal of a tested loop by using a host and transmitting the voltage signal to each slave;

each slave machine calculates the electric energy according to the acquired voltage signal from the host machine and the current signal of the tested loop where the slave machine is located, and the current signal is acquired by the slave machine to acquire the measurement data of each slave machine and store and transmit the acquired measurement data to the host machine;

the host machine configures and combines each slave machine, maps the slave machines into a plurality of virtual three-phase loop measuring terminals and/or a plurality of -phase loop measuring terminals, and combines the measuring data transmitted by each slave machine to obtain the monitoring data corresponding to the virtual three-phase or single-phase loop measuring terminals so as to realize the electric energy monitoring of a plurality of loops.

Further, as a preferred technical solution of the present invention: the method further comprises the steps that the host computer collects current signals of a tested loop where the host computer is located, and electric energy is calculated by combining the voltage signals collected by the host computer to obtain monitoring data of the host computer.

Further, as a preferred technical solution of the present invention: the host computer carries out configuration combination on each slave computer, the slave computers are registered in an association table in a memory of the host computer to form a virtual three-phase or single-phase loop measuring terminal, communication addresses of the slave computers are automatically allocated, and the communication addresses of the virtual three-phase or single-phase loop measuring terminal are configured and stored in the host computer.

By adopting the technical scheme, the invention can produce the following technical effects:

the host machine is a complete electric energy monitoring terminal, can be independent from the slave machine to run, and realizes the function of monitoring the electric energy of 1-path three-phase loop or 3-path single-phase loop. When the 3-path single-phase loop electric energy monitoring function is realized, the host machine is virtualized into 3 single-phase loop measuring terminals. The host and the slave are connected by flexible cables, the relative installation positions of the host and the slave are not limited, the host and the slave can be discretely arranged and installed according to the actual situation of an application field, and the number of the slaves required to be matched with the host can be flexibly increased or decreased according to the requirement. The electric energy monitoring terminal can meet the requirements of quick installation and deployment, uninterrupted installation support, small equipment size, adaptability to small branch loop measurement, wireless communication, low hardware and construction cost.

Therefore, compared with the prior art, the invention has the following advantages:

1. in the application of realizing multi-loop measurement, only the host machine of the invention is required to collect voltage signals of a power grid through an external insulation piercing wire clamp or a spare outgoing wire at a certain position in a bus or a certain three-phase loop and share the voltage signals for measurement calculation of slave machines of other measurement loops, thereby avoiding multi-point piercing power-taking construction in particular reconstruction projects, improving reconstruction safety, solving the problem of difficult reconstruction site power-off construction, simultaneously saving a voltage signal collection module for the slave machines, well supporting the minimized design of the slave machine volume and saving hardware cost, and leading the slave machines to be well applied to small-branch loop measurement.

2. The slave machine of the invention adopts the integrated design of the open type current transformer and the measurement control module, and has small volume. The slave machine can be directly sleeved on a branch loop cable of a distribution box similar to a floor to directly measure an electric loop; for a large-current loop, the secondary loop cable of the external large-current transformer can be sleeved with the slave computer to indirectly measure the electric loop, the old-utilization transformation construction of the electric loop of the original current transformer is very convenient, and the construction efficiency is very high, so that the construction cost is saved.

3. The host communication module comprises an RS-485 wired communication module and an L oRa wireless communication module, the wireless communication mode can obviously reduce the construction complexity of a reconstruction project, the measured data of a plurality of loops of the multi-loop electric energy monitoring terminal is uploaded to an upper computer system through the communication module of the host in a centralized manner, the total wireless communication node number of the project is reduced, the wireless networking complexity is reduced, the hardware cost of the communication module is obviously reduced, the wired communication mode can be selected in the occasion of conveniently constructing a wired communication network, and the selection flexibility of the communication mode is improved.

4. The number of the slave machines can be flexibly increased and decreased according to the number of measuring loops of a project site, the connection and expansion are very convenient through the prefabricated flexible cables with crystal heads at two ends, the slave machines can be discretely distributed, and the relative installation positions of the slave machines are not limited. Each slave machine can be combined into a plurality of virtual three-phase loop measuring terminals and a plurality of virtual single-phase loop measuring terminals on the host machine according to actual conditions, and the difficulty of loop combing and the construction period are reduced.

Drawings

Fig. 1 is a block diagram of a master-slave discretely-distributable multi-loop electric energy monitoring terminal according to the present invention.

Fig. 2 is a block diagram of the structure of the host of the present invention.

Fig. 3 is a block diagram of a slave according to the present invention.

Fig. 4 is a circuit diagram of a controller module of the host of the present invention.

Fig. 5 is a circuit diagram of a voltage signal acquisition module of the host of the present invention.

Fig. 6 is a circuit diagram of a current signal acquisition module of the host of the present invention.

FIG. 7 is a circuit diagram of a metering module of the host of the present invention.

Fig. 8 is a circuit diagram of the crystal head jack of the master-slave interface module of the host of the present invention.

Fig. 9 is a circuit diagram of the sampled voltage signal level boost and follower of the master-slave interface module of the master of the present invention.

Fig. 10 is a circuit diagram of a power output current limiting switch of a master-slave interface module of a host according to the present invention.

Fig. 11 is a circuit diagram of a slave measurement control module of the present invention.

Fig. 12 is a table showing a link mapping relationship between the host internal virtual monitor terminal and the slave according to the present invention.

FIG. 13 is a diagram of an example of the appearance of a host according to the present invention.

Fig. 14 is a diagram of an example of the appearance of a slave machine of the present invention.

Fig. 15 is a diagram of the effect of a typical engineering installation of the present invention.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1, the invention designs a master-slave multi-loop electric energy monitoring terminal capable of being discretely distributed, which comprises a master machine and a plurality of slave machines, wherein the master machine is connected with each slave machine by flexible cables.

As shown in fig. 2, the host includes a current signal collecting module, a voltage signal collecting module, a metering module, a power supply module, a controller module, a communication module, a man-machine interaction module, and a host-slave interface module, wherein an output end of the current signal collecting module and an output end of the voltage signal collecting module are respectively connected to an input end of the metering module, an output end of the metering module is connected to the controller module, and the metering module is responsible for measuring and calculating collected voltage and current signals and interacting with the controller module; the controller module is also connected with the communication module, the man-machine interaction module and the master-slave machine interface module respectively; the other output end of the voltage signal acquisition module is respectively connected with the power supply module and the master-slave machine interface module, and the power supply module is connected with the master-slave machine interface module; one of the phase inputs of the voltage signal acquisition module is the same as the phase input of the power supply module, so that the power supply module provides power supply input for the power supply module, and transmits a voltage acquisition signal to the master-slave machine interface module, and on one hand, the master machine self is provided with a working power supply; on the other hand, the power supply module is transmitted to the master-slave interface module of each slave machine through the master-slave interface module of the master machine and the flexible cable, and provides working power supply for each slave machine.

As shown in fig. 3, each slave machine includes a current signal collection module, a measurement control module, and a master-slave machine interface module, wherein an output end of the current signal collection module is connected to the measurement control module, and the measurement control module is connected to the master-slave machine interface module to obtain a working power supply and a voltage signal; the measurement control module carries out measurement calculation and storage according to the acquired voltage signal and current signal respectively, and carries out communication interaction with the host through the host-slave interface module, thereby realizing the functions of parameter setting, measurement data transmission and the like.

Each interface of the master-slave interface module of the master is connected with one interface of the master-slave interface module of one slave, the other interface of the master-slave interface module of the connected slave is connected with any interface of the master-slave interface module of the next slave, and the like, and the connecting line of the master-slave interface module and the slave interface module adopts a flexible cable.

In this embodiment, the master adopts a single-phase or multi-phase master-slave interface module, where the multi-phase master-slave interface module of the master may include an a-phase master-slave interface, a B-phase master-slave interface, and a C-phase master-slave interface, the master is connected with each slave through each phase master-slave interface, and multiple slaves of the same phase are topologically extended in a daisy chain bus manner. The flexible cable in the embodiment adopts a prefabricated 6-core telephone line, and connectors at two ends of the cable adopt RJ12 crystal plugs, so that the connection between a host and a slave machine and the connection between the slave machine and the slave machine are convenient.

The master-slave machine interface module of the host machine comprises a sampling voltage signal level lifting and following module, a power output current limiting switch module and three crystal head jacks, wherein each crystal head jack respectively comprises three signal loops of power supply, voltage and communication; the three crystal head jacks provide 3 contacts for power supply, voltage signal, serial communication and the like. The master-slave machine interface module of the slave machine comprises two crystal head jacks, each crystal head jack comprises three signal loops of power supply, voltage and communication, and the three signal loops of one crystal head jack are respectively connected with the three signal loops of the other crystal head jack in parallel.

And the joints at two ends of the flexible cable adopt crystal heads, the crystal head at one end of the flexible cable 1 is inserted into a crystal head jack of a master-slave machine interface module of the master machine, the crystal head at the other end of the flexible cable 1 is inserted into a crystal head jack of a master-slave machine interface module of the slave machine 1, the crystal head at one end of the flexible cable 2 is inserted into another crystal head jack of the master-slave machine interface module of the slave machine 1, the crystal head at the other end of the flexible cable 2 is inserted into a crystal head jack of the master-slave machine interface module of the slave machine 2, and so on, the hand-pulling connection between the master machine and the slave machine and between the slave machine and the slave machine is rapidly completed.

The voltage signal acquisition module of the host in the terminal comprises three voltage signal acquisition loops, and each phase voltage signal acquisition loop comprises a voltage reduction circuit and a filter circuit. The voltage signal after voltage reduction and filtering processing comprises two branches, and one branch is transmitted to a metering module of the host; the other branch is transmitted to the master-slave interface module of the master machine and is transmitted to the master-slave interface module of each slave machine through a flexible cable connected with the master-slave interface module of the master machine.

The voltage signal acquisition module of the host machine acquires voltage signals of a power grid from a bus or a certain three-phase loop through an external insulation piercing connector, after voltage reduction and filtering processing, the voltage signals and current signals acquired by the current signal acquisition module are transmitted to the metering chip to participate in measurement operation to obtain monitoring data of the host machine, and simultaneously transmitted to the master-slave machine interface module of the host machine, and the monitoring data are output and shared to slave machines of other measurement loops through the master-slave machine interface module to be measured and calculated.

The slave machine collects the current signal of the tested loop through the current signal collecting module of the slave machine, obtains the voltage signal from the master machine through the master machine interface module and transmits the current signal and the voltage signal collected by the slave machine to the measuring control module of the slave machine so as to measure and calculate the electric energy, obtain and store the measured data of the slave machine, and the measured data of each slave machine is transmitted to the master machine through the master machine interface module and the slave machine interface module and flexible cable communication. And the host machine configures and combines each slave machine according to the actual application condition, maps the slave machines into a plurality of virtual three-phase loop monitoring terminals and a plurality of -phase loop monitoring terminals, combines the measurement data transmitted from the slave machines to the host machine into the monitoring data corresponding to the virtual monitoring terminals, and realizes the electric energy monitoring of a plurality of loops. The external upper computer system is in wired or wireless connection with the communication module of the host machine, and communicates with the virtual monitoring terminal to acquire data of the virtual monitoring terminal. And the host machine can also acquire the current signal of the tested loop where the host machine is positioned, and the host machine acquires monitoring data by calculating the electric energy by combining the voltage signal acquired by the host machine.

This embodiment shows a specific circuit configuration of the monitor terminal of the present invention, as shown in fig. 4 to 11 described below. The method comprises the following specific steps:

as shown in fig. 4, the CPU of the host controller module adopts a L PC1766 chip, pin 4 is connected to pin 7 of the watchdog chip IMP706R, pins 48 and 49 are connected to

pins

5 and 6 of the EEROM chip 24L C256, pins 58 and 59 are connected to

pins

6 and 5 of the FRAM memory chip FM24C L16A, pins 76, 77, 78 and 79 are connected to

pins

5, 2, 6 and 1 of the F L ASH memory chip, respectively, the communication module includes an RS-485 wired communication module, a L oRa wireless communication module and a bluetooth communication module, TX and RX pins of the RS-485 wired communication module are connected to

pins

47 and 46 of the controller module CPU, TX and RX pins of the L oRa wireless communication module are connected to pins 99 and 98 of the controller module CPU, respectively, and TX and RX pins of the bluetooth communication module are connected to pins 75 and 74 of the controller module CPU, respectively.

Specifically, in the host voltage signal acquisition module shown in fig. 5, voltage division is performed on an a-phase voltage through resistors BR1, BR2, BR3, BR4 and BR44 to obtain voltage reduction outputs at two ends of a resistor BR44, and the voltage reduction outputs are transmitted to pins 12 and 13 of the metering module and a host-slave interface module shown in fig. 7, wherein the resistor BR44, the resistor BR45, the capacitor BC36 and the capacitor BC37 form an anti-aliasing filter circuit for acquiring the a-phase voltage signal, and the voltage regulator tube BD2 is used for overvoltage protection; voltage division is carried out on the B-phase voltage through resistors BR5, BR6, BR7, BR8 and BR47, voltage reduction output at two ends of a resistor BR47 is obtained and is transmitted to pins 14 and 15 of a metering module and a master-slave machine interface module shown in fig. 7, wherein the resistor BR47, the resistor BR49, the capacitor BC49 and the capacitor BC50 form an anti-aliasing filter circuit for collecting B-phase voltage signals; the voltage of the C-phase voltage is divided by resistors BR9, BR10, BR11, BR12 and BR51, so that the voltage-reduced output at two ends of the resistor BR51 is obtained and transmitted to pins 16 and 17 of the metering module and a master-slave interface module shown in fig. 7, wherein the resistor BR51, the resistor BR53, the capacitor BC53 and the capacitor BC54 form an anti-aliasing filter circuit for acquiring the C-phase voltage signal.

As shown in fig. 6, the host current signal acquisition module may adopt a current transformer, and the current transformer is open or closed. The positive electrode of the secondary output of the current transformer 1 is connected with a pin 4 of a metering module RN8302 chip shown in fig. 7 after passing through a resistor AR5, and the negative electrode of the secondary output of the current transformer 1 is connected with a pin 5 of the metering module RN8302 chip shown in fig. 7 after passing through a resistor AR6, wherein the resistor AR11, the resistor AR12, the capacitor BC3 and the capacitor BC4 form an anti-aliasing filter circuit for collecting phase-A current signals; the positive electrode of the secondary output of the current transformer 2 is connected with a pin 7 of a metering module RN8302 chip shown in fig. 7 after passing through a resistor AR3, and the negative electrode of the secondary output of the current transformer 2 is connected with a pin 8 of the metering module RN8302 chip shown in fig. 7 after passing through a resistor AR4, wherein the resistor AR9, the resistor AR10, the capacitor BC5 and the capacitor BC6 form an anti-aliasing filter circuit for collecting phase B current signals; the positive electrode of the secondary output of the current transformer 3 is connected with a pin 10 of a metering module RN8302 chip shown in fig. 7 after passing through a resistor AR1, and the negative electrode of the secondary output of the current transformer 3 is connected with a pin 11 of the metering module RN8302 chip shown in fig. 7 after passing through a resistor AR2, wherein the resistor AR7, the resistor AR8, the capacitor BC7 and the capacitor BC8 form an anti-aliasing filter circuit for collecting C-phase current signals.

As shown in fig. 8, 9, and 10, the master-slave interface module of the host includes a sampling voltage signal level boosting and following module, a power output current limiting switch module, and three crystal head jacks, each of which includes three signal loops of power, voltage, and communication, wherein the power signal loop is connected to the power output current limiting switch module, the voltage signal loop is connected to the sampling voltage signal level boosting and following module, and the communication loop is connected to the communication module of the host.

Specifically, as shown in fig. 8, the master-slave interface module of the master includes three crystal plug jacks, preferably three RJ12 jacks, corresponding to the slave connections of the a phase, the B phase and the C phase, respectively, pins of each RJ12 jack are defined consistently, and pin 1 of RJ12 is a power signal and transmits a working power supply to each slave; the pin 2 is a phase identification signal, and the slave machine can identify that the phase measured by the slave machine belongs to one of the phases A, B and C through the signal, and can be used for identifying the phase configuration error; the

pins

3 and 4 are serial port communication signals, so that communication interaction between the host and the slave is realized; the pin 5 is a public ground wire; the pin 6 transmits the synchronous voltage signals collected by the host to each slave for measurement and calculation, and the three RJ12 jacks transmit the synchronous voltage signals of the phase A, the phase B and the phase C respectively.

As shown in fig. 9, the sampled voltage signal level raising and following module adopts a reference power supply AME431BAJETA25Z and an operational amplifier T L C2274AID, pins 1 and 2 of the reference power supply are connected to one end of a resistor ER17, the other end of the resistor ER17 is connected to the anodes of diodes ED3, ED4 and ED5, the cathodes of the diodes ED3, ED4 and ED5 are connected to

pins

3, 5 and 10 of three operational amplifiers EU3A, EU3B and EU3C, pins 1, 7 and 8 of three operational amplifiers EU3 are connected to pins 6 of a-phase, B-phase and C-phase RJ12 jacks shown in fig. 8, pins 3, 5 and 10 of the operational amplifier EU3 are connected to one ends of resistors ER6, ER10 and ER12, the other ends of the resistors ER6, ER10 and ER12 are connected to pins 16, RN 14, RN 12 of a metering amplifier chip 02, the operational amplifier EU 2 is connected to one end of the sampling module, EU 848, and the sampling module is connected to the output of the slave module.

As shown in fig. 10, the power output current-limiting switch module adopts an ETA6010 chip, pin 1 and pin 3 of the ETA6010 chip are connected in a short circuit manner and connected to one end of a filter capacitor EC1, and finally connected to a 5V power output from the power module, the other end of the filter capacitor EC1 is grounded, pin 2 of the ETA6010 chip is grounded, pin 4 is connected to one end of a resistor ER14, the other end of the resistor ER14 is grounded, an output pin 5 of the ETA6010 chip is connected to the positive electrode of an energy storage capacitor EC2, the negative electrode of the energy storage capacitor EC2 is grounded, and the maximum current of the 5VCC1 is limited by adjusting the resistance of ER14, so as to limit the maximum operating current of the power supply 5VCC1 transmitted from the master-slave interface module to the slave, and ensure the safety of electricity utilization.

As shown in fig. 11, the measurement control module of the slave is implemented by using an RN8211B chip, the L end of the secondary side outgoing line of a current transformer implemented by a slave current signal acquisition module is connected with pin 10 of an RN8211B chip, the N end of the secondary side outgoing line of the current transformer is connected with pin 11 of an RN8211B chip, two crystal header jacks of a master-slave interface module of the slave are implemented by using 2 sets of RJ12 jacks, the same pins of 2 sets of RJ12 jacks are respectively short-circuited, the RJ12 jack pins are defined to be consistent with the RJ12 jack of the host shown in fig. 8, pins 6 and 7 of an RN8211B chip are respectively connected with

pins

6 and 5 of an RJ12 jack, pins 39 and 40 of an RN8211B chip are respectively connected with

pins

7 and 6 of a 24L C256 storage chip for storing slave parameters and measurement data, pin 59 of an RN8211B chip is connected with pin 2 of a programming button BK1, and pin 58 of an AD 82B chip is connected with the anode of an operation indicator.

In addition, the current signal acquisition module of the slave adopts a current transformer, and the current transformer adopts an open type or a closed type. Preferably, the slave machine can further comprise a cable tie limiting pile, so that the slave machine is conveniently tied to a cable of the tested loop.

The invention also provides a master-slave multi-loop electric energy monitoring method capable of realizing discrete distribution, which is based on a master machine and a plurality of slave machines, can be used for the structure terminal, but is not limited to the structure, and specifically comprises the following steps:

the method comprises the following steps that 1, a master-slave multi-loop electric energy monitoring terminal which can be discretely distributed can be connected with at most 30 slave machines, a host machine is arranged according to practical application conditions, and the host machine is connected with the slave machines through master-slave machine interfaces of all phases by adopting flexible cables.

And 2, acquiring voltage signals of a power grid from a bus or a certain three-phase loop through an external insulation piercing connector by using a voltage signal acquisition module in the host, acquiring voltage signals of a tested loop, performing voltage reduction and filtering processing on the voltage signals, transmitting the voltage signals to a metering module to participate in measurement operation, acquiring current signals of the tested loop where the host is located by using a current signal acquisition module of the host, and calculating electric energy by combining the voltage signals acquired by the host to obtain monitoring data of the host. Meanwhile, the voltage signal of the collected tested loop can be transmitted to each slave machine through the master-slave machine interface module.

And 3, acquiring a voltage signal from the host by the master-slave machine interface module of each slave, acquiring a current signal of a tested loop where the slave is located by the current signal acquisition module of the slave, calculating electric energy by the metering control module according to the voltage signal and the current signal to obtain measurement data of each slave, and storing the obtained measurement data and transmitting the measurement data to the host through the master-slave machine interface module.

And 4, the host machine configures and combines each slave machine, maps the slave machines into a plurality of virtual three-phase loop measuring terminals and/or a plurality of -phase loop measuring terminals, and combines the measuring data transmitted by each slave machine received by the interface module of the host machine and the slave machine to obtain the monitoring data corresponding to the virtual three-phase or single-phase loop measuring terminals so as to realize the electric energy monitoring of a plurality of loops.

The master machine configures and combines each slave machine according to the actual application situation, registers the slave machine into an association table in the memory of the master machine to establish a virtual three-phase or single-phase loop measurement terminal, that is, maps the virtual three-phase or single-phase loop measurement terminals into a plurality of virtual three-phase loop monitoring terminals and a plurality of -phase loop monitoring terminals, and establishes an association table, as shown in fig. 12. The communication addresses of the slave machines are automatically generated and configured by the host machine, the measurement data transmitted to the host machine by the slave machines are combined into measurement data corresponding to the virtual monitoring terminals, the electric energy monitoring of a plurality of loops is realized, the virtual monitoring terminals can be set with virtual communication addresses, and the upper computer system communicates with the virtual monitoring terminals through wired or wireless connection established with the host machine to obtain the data of the virtual monitoring terminals. After the virtual monitoring terminal is configured by the inside of the host, the slave needs to be associated with the virtual monitoring terminal, for example: a certain slave machine is associated to phase A of the number 1 virtual monitoring terminal, the slave machine operation can be downloaded in a host machine man-machine interaction module, at the moment, a programming button BK1 is pressed, a working indicator lamp AD1 is triggered to change from normal lighting to periodical flashing, the slave machine enters a programming state, the host machine sends a broadcast message to the slave machine through a crystal head jack to realize the communication address setting of the slave machine firstly, only the slave machine in the programming state responds to the message and carries out communication interaction with the host machine, after the communication address setting of the slave machine is completed, the working indicator lamp of the slave machine is changed to be normal lighting or flashes according to the communication rhythm, the host machine continues to carry out other parameter configuration on the slave machine of which the communication address is completely set, and. When the phase of the virtual monitoring terminal associated with the slave is inconsistent with the phase of the host crystal head jack actually and physically connected with the slave, the host generates an alarm to prompt.

In addition, the appearance of the host computer is shown in fig. 13, the communication interface of the host computer to the upper computer system comprises RS-485 wired communication, L oRa wireless communication and Bluetooth communication, the upper computer system can select the RS-485 wired communication or L oRa wireless communication mode to carry out communication interaction according to the construction convenience degree of an engineering field, the front side of the host computer is provided with a unique two-dimensional code identification tag, the Bluetooth is opened by the mobile phone, matched APP application software with user authority control is used for scanning codes of the host computer, the host computer and the mobile phone can establish Bluetooth connection, and corresponding parameter lookup and setting of the master-slave type discretely-distributed multi-loop electric energy monitoring terminal are achieved.

The appearance of the slave of the embodiment is as shown in fig. 14, the slave adopts the design of 8-sided polygon in cross section, and the purpose is to reduce the unused space in the slave, so as to reduce the installation height of the slave during engineering installation and adapt to the environment with narrow installation space. The measuring current range of the slave machine has two specifications of 75A and 5A, wherein the 75A specification directly measures the measured loop, the 5A specification measures the secondary loop of the external large-current transformer, and the indirect measurement is carried out on the measured loop. The current transformer of the slave can select a closed mode and an open mode.

A master-slave multi-loop electric energy monitoring terminal capable of being distributed discretely can be typically applied to engineering, wherein a host is installed in a floor electric box, a main incoming line loop of the monitoring electric box of the host and slave machines of 75A specifications monitor each outgoing line loop, the number of the installed slave machines is determined according to the number of the outgoing line loops needing to be monitored, the slave machines are bound on a line to be detected through binding belts, the slave machines are connected with hands of the same phase through prefabricated 6-core telephone cables and finally connected to RJ12 jacks corresponding to the host, voltage signals are taken from insulating puncture wire clamps which are crimped on the incoming line loops, and the master machine and the slave machine are in communication connection in an RS-485 wired communication or L oRa wireless communication mode.

The typical application of the master-slave multi-loop electric energy monitoring terminal capable of being distributed discretely in engineering can also be that in a low-voltage distribution room of a user substation, one low-voltage distribution cabinet is provided with one host, each outgoing line of a plurality of outgoing line drawers of the distribution cabinet is provided with an external current transformer, a secondary side loop of the external current transformer forms a closed loop nearby, a slave machine with the specification of 5A is arranged on the secondary side loop of the external current transformer to realize indirect measurement, the number of the arranged slave machines is determined according to the number of outgoing line loops to be monitored, the slave machines are connected with hand-held hands with the same phase by using a prefabricated 6-core telephone cable and finally connected to RJ12 jacks corresponding to the host machines, voltage signals are taken from the outgoing lines of a standby drawer of a certain low-voltage distribution cabinet in the whole low-voltage distribution room, the host machines on the low-voltage distribution cabinets can share the voltage signals, the host machines on the low-voltage distribution cabinets can be in communication connection with an upper computer in an RS-485 wired communication mode or a L oRa wireless communication mode, and when the RS-485 wired communication mode is adopted.

In summary, the host of the invention can operate independently, realize the electric energy monitoring of 1 three-phase circuit or 3 single-phase circuits, the bus between the host and the slave integrates the functions of power transmission, voltage signal transmission and communication between the master and the slave, the slave collects the current signal of the measured circuit, combines the voltage-reduced voltage signal obtained from the bus to complete the measurement and calculation of the measured circuit, transmits the data to the host through bus communication, and the host completes the integrated management of the measured data to realize the electric energy monitoring of a plurality of three-phase circuits or single-phase circuits. The method avoids multi-point puncture electricity taking construction in the transformation project, improves transformation safety, solves the problem of difficulty in power-off construction on the transformation site, reduces difficulty in loop combing and construction period, well supports the minimized design of the volume of the slave machine, saves hardware cost, and enables the slave machine to be well applied to small branch loop measurement.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. A master-slave multi-loop electric energy monitoring terminal capable of being distributed discretely comprises a master machine and a plurality of slave machines, and is characterized in that:

the host comprises a current signal acquisition module, a voltage signal acquisition module, a metering module, a power supply module, a controller module, a communication module, a man-machine interaction module and a master-slave machine interface module, wherein the input end of the metering module is respectively connected with the output end of the current signal acquisition module and one output end of the voltage signal acquisition module, and the output end of the metering module is connected with the controller module; the controller module is also connected with the communication module, the man-machine interaction module and the master-slave machine interface module respectively; the other output end of the voltage signal acquisition module is respectively connected with the power supply module and the master-slave machine interface module, and the power supply module is connected with the master-slave machine interface module;

2. The master-slave discretely distributable multi-loop electric energy monitoring terminal according to claim 1, wherein: the voltage signal acquisition module of the host comprises three voltage signal acquisition loops, wherein each voltage signal acquisition loop comprises a voltage reduction circuit and a filter circuit which are connected.

3. The master-slave discretely distributable multi-loop electric energy monitoring terminal according to claim 1, wherein: the master-slave machine interface module of the host machine comprises a sampling voltage signal level lifting and following module, a power output current limiting switch module and three crystal head jacks, wherein each crystal head jack respectively comprises a power supply, a voltage and a communication three signal loop, the power supply signal loop is connected with the power output current limiting switch module, the voltage signal loop is connected with the sampling voltage signal level lifting and following module, and the communication loop is connected with the communication module of the host machine.

4. The master-slave discretely distributable multi-loop electric energy monitoring terminal according to claim 1, wherein: the master-slave machine interface module of the slave machine comprises two crystal head jacks, each crystal head jack comprises three signal loops of power supply, voltage and communication, and the power supply loop, the voltage loop and the communication loop of one crystal head jack are respectively connected with the power supply loop, the voltage loop and the communication loop of the other crystal head jack in parallel.

5. The master-slave discretely distributable multi-loop electric energy monitoring terminal according to claim 1, wherein: and each slave machine is provided with a ribbon limiting pile for being fixed on the tested loop cable.

6. A master-slave mode discretely-distributed multi-loop electric energy monitoring method is based on a master machine and a plurality of slave machines, and is characterized by comprising the following steps:

7. The master-slave discretely distributable multi-loop electric energy monitoring method as recited in claim 6, wherein: the method further comprises the steps that the host computer collects current signals of a tested loop where the host computer is located, and electric energy is calculated by combining the voltage signals collected by the host computer to obtain monitoring data of the host computer.

8. The master-slave discretely distributable multi-loop electric energy monitoring method as recited in claim 6, wherein: the host computer carries out configuration combination on each slave computer, the slave computers are registered in an association table in a memory of the host computer to form a virtual three-phase or single-phase loop measuring terminal, communication addresses of the slave computers are automatically allocated, and the communication addresses of the virtual three-phase or single-phase loop measuring terminal are configured and stored in the host computer.